Coal-mining machine.



PATENTED JULY 18, 1905.

C. J. SMITH. COAL MI G MACHINE. APPLIOATIO ED MAY.23,1903.

UNITED STATES Patented July is, 1905.

PATENT OFFICE.

CLARK J. SMITH, OF OTTUMVVA, IOWA, ASSIGNOR TO MARTIN I-IARDSOOG, OFOTTUMWA, IOWA.

COAL-MINING MACHINE.

SPECIFICATION forming part of Letters Patent N0. 794,818, dated July 18,1905.

Application filed May 23, 1903. Serial No. 158,419.

To (LU whom it may concern:

Be it known that I, CLARK J. SMITH, a citizen of the United States ofAmerica, and a resident of Ottumwa, Wapello county, Iowa, have inventeda new and useful Coal-Mining Machine, of which the following is aspecification.

The object of this invention is to rovide improved means for miningcoal, an relates to that type of machines employed to out under a seamor vein of coal and permit the body to fall by gravity the depth of thespace excavated thereunder.

My invention consists in the construction, arrangement, and combinationof elements hereinafter set forth, pointed out in my claims, andillustrated by the accompanying drawings, in which- Figure 1 is a sideview of the cutting mechanism, portions thereof being broken away toeconomize space. Fig. 2 is a crosssection of the cutting mechanism. Fig.3 is a detail perspective of one of the cutters. Fig. 4 is a detailcross-section showing the means employed to mount one of the cutters onthe screw.

In the construction of the device as shown the numeral 10 designates acutter-bar, preferably circular in cross-section and formed as a screw,the helix of which varies in pitch from end to end, being of greaterpitch at one end than at the other end. The cutter-bar 10 has a singlehelical flange 11 thereon, and said flange is formed with a plane faceon one side. Cutters are provided and are formed in sections 12, each ofwhich sections preferably is made of sheet metal of the desiredthickness and quality and punched with holes 13 14, adapted to receiverivets 15 or bolts or screws whereby the sections may be attached to thehelical flange or screw 11 of the cutter-bar 10. The sections 12 aremount ed end to end and abutting in series throughout the length of theplane face of the helical flange or screw 11 of the cutter-bar 10 andconjunctively provide a continuous serrated jagged or toothed helicalcutter, inasmuch as each section is formed with one or more teeth 16,(in this instance two,) which teeth pro- -whereby the tooth isintegrally connected to the section.

In the rotation of the cutter-bar 10 in one direction the teeth of thecutter-sections 12 thereon engage and scratch, cut, disintegrate, andremove soil, earth, and mineralsubstances contacted thereby, and thescrew will clear away the material cut by said teeth. The pitch of thescrew varies, as described and shown, in order that it may draw andconvey the substances cut by the teeth more rapidly at one end than atthe other.

' I claim as my invention 1. In a machine of the class described, thecutting mechanism, comprising the cutter bar, the screw thereon andprojecting wholly from the periphery of the bar and the helicalsectional cutters on said screw.

2. In a machine of the class described, the cutting mechanism,comprising a cutterbar circular in cross-section, a helical flangethereon and projecting wholly from the periphery of the bar and helicalcutter-sections mounted on said helical flange.

3. In a machine of the class described, a

cutting mechanism comprising a cutter-bar circular in cross-section, ahelical flange thereon and projecting wholly from the periphery of thebar and helical cutter-sections mounted end to end and abutting inseries on and throughout the length of said helical flange.

4. In a machine of the class described, a cutting mechanism comprising acutter-bar, a helical flange thereon and formed with a plane face on oneside, and helical cutter-sections mounted end to end on the plane faceof the helical flange and fixed to said flange.

5. In a machine of the class described, a cutter-bar, a helical flangeintegrally formed thereon and of varying pitch from end to end andhelical cutter-sections detaehablymounted on said flange.

6. In a machine of the class described, a cutter-bar, a helicalcutter-section formed of sheet metal and having teeth projected from onemargin thereof and also formed with I cutter-bar having a helical flangeand helical holes in its body portion adapted to receive cutter-sectionsdetachably mounted on said fastening means for mounting said sectionflange, each of said sections formed with on a cutter-bar. hooked teethprojecting from one margin I 5 5 7. In a machine of the class described,a thereof.

cutter-bar having a helical flange, and helical Signed by me at Ottumwa,Iowa, this 19th cutter-sections detachably mounted on said day of March,1903.

helical flange, each of said sections formed of CLARK J. SMITH. sheetmetal with teeth projecting from one Witnesses: 1o margin thereof. W. A.WORK,

8. In a machine of the class described, a HELEN LOTSPEIOH.

